By the numbers: A glance at Wisconsin's population

Wisconsin voters will decide Tuesday whether to keep Republican Gov. Scott Walker in office or replace him with Milwaukee's mayor. Here's a look at the economy, population and politics about the state the winner will be in charge of leading after the ballots are counted:

UNION MEMBERSHIP2011: 339,000, or 13.3 percent of wage and salary workers in Wisconsin, compared with 14.2 percent a year earlier. In 1989, the rate was 20.9 percent.

ECONOMYWisconsin's unemployment rate was 6.7 percent in April, which was better than the national rate of 8.1 percent. It's also the lowest it's been in Wisconsin since 2008 and better than when Walker took office in January 2011, when unemployment was at 7.4 percent.Wisconsin is known as America's Dairyland, ranking No. 1 in cheese production nationally and No. 2 in milk production. It has about 1.26 million dairy cows, about 1 cow for every 5 residents.